Canada

There are two massive policy gaps that the federal and provincial governments are failing to close:

• We're a few million houses behind where we should be. Our governments should be building housing. The homes can be sold or rented, it doesn't matter. But it needs to be done below market rates.
• We don't have enough people building houses. They should be offering incentives to get more people trained, funding startups that are building housing more efficiently, and bring in immigrants who can/will work construction.
• Canadian taxes financialize housing by providing exemptions for profit on home sales and write-offs for mortgage payments. There should be lifetime limits to take money out of the real estate sector.

Both the federal Conservatives and Liberals are "encouraging" relaxation of gAtEkEePers by getting provinces/municipalities to remove restrictions on construction. But we can't rely on the private builders to create housing that will be affordable to most young Canadians.

EDIT: added the tax thing.